修改插件代码

plantuml-renderer/public/class-plantuml-renderer-public.php

private function encodep( $text ) {
    //$data = utf8_encode( $text );  //这行注释
    $data=$text;                     //改成这个,text变量本身是utf8编码了,所以不需要转了
    $compressed = gzdeflate( $data, 9 );
    return $this->encode64( $compressed );
}